#all{
    width: 1000px;
    margin: 0px auto;
}

#all h1{
    text-align: center;
}

.tab{
    width: 1000px;
}

.tab thead tr{
    background: rgba(189, 189, 189, 0.79);
    text-align: center;
    font-weight: bold;
    font-size: 18px;
}

.tab tbody tr td{
    text-align: center;
}

.tit a{
    color: black;
    text-decoration: none;
}

.tit a:hover{
    color: #416cd7;
    text-decoration: none;
}